One of the big issues is that entire gaps in her emails around Benghazi were missing. Before people were on to her having her own server (that she is not supposed to). Seeing that she may have conducted her own extragovernmental intelligence in Libya, hidden on her email server, outside of proper and official channels, where people died - yeh it is important.
Even if she is completely clean wrt Benghazi (in the realm of possibility) she may have been covering for her server that she should not have had.
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